"The written works of one of the most forward-thinking conservationists of the 20th century, Aldo Leopold, are part of the University of Wisconsin Digital Collections. Leopold had numerous interests encompassing "forestry, wildlife management, conservation biology, sustainable agriculture, restoration ecology, private land management, environmental history, literature, education, esthetics, and ethics." He authored several environmental books, including A Sand County Almanac (1949), and created and maintained a huge repertoire of letters and other correspondence, diaries, memoranda, essays, research reports, committee meeting minutes, journals, and county, state, and foreign files. Funded by the National Historical Publications and Records Commission, the Aldo Leopold Archives contains digitized resources from Leopold's main body of work from the end of the 19th century until his death in 1948." from Choice, Feb 2009.